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i 29 July 2005 AGE-NC Project No..95-0185 Page 2 of 4 2.2.1. Well Monitoring and Evacuation The water level and any free-phase petroleum product in wells MW-1 through MW-4 were measured relative to the tops of the well casings using a Solinst free product interface probe;the ground water ' elevations and gradient were determined from this data(Table 1). After gauging the depth to ground water, each monitoring well was purged with a dedicated, ' disposable bailer. Between 3 and 6.5 gallons of ground water were removed from wells MW-1 through MW-4. Temperature, pH and conductivity were measured at regular intervals during purging using an Oakton water analyzer(Appendix B).Purged water was stored on-site in 55-gallon Department of Transportation (DOT)-approved drums. 2.2.2. Collection and Analysis of Ground Water Samples _ ' Ground water samples were collected from the purged wells using the dedicated, disposable polyethylene bailers. Each water sample was transferred into three 40-m1 volatile organic analysis (VOA)vials containing 0.5 m118%hydrochloric acid as a sample preservative and one 1-liter amber ' bottle without preservative. The samples were then labeled and placed in a chilled container for transport under chain of custody to Cal Tech Environmental Laboratories(CTEL)of Paramount, a j California Department of Health Services(DHS)-certified analytical laboratory. All water samples were analyzed for: • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in accordance with EPA Method 8015 Modified and • Benzene, toluene, ethylbenzene.and total xylenes (BTEX), and the fuel additives methyl ' tertiary butyl ether(MTBE),tertiary butanol(TBA),di-isopropyl ether(DIPE),ethyl tertiary butyl ether(ETBE)and tertiary amyl methyl ether(TAME)in accordance with EPA Method 8260 Modified. ' 3.0. FINDINGS The ground water elevation, gradient and flow direction were determined from the field data. ' Contaminant impact to ground water was assessed by field observations and laboratory analysis. I Advanced GeoEnvironmental,Inc.